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#include <stdint.h>
#include <stdio.h>
union [[gnu::transparent_union]] un {
char *ptr;
intptr_t i;
};
void call(void (*cb)(union un)) { cb("FOO"); }
void cb(char *str) { printf("%s\n", str); }
int main(int argc, char *argv[]) {
call(cb);
return 0;
}
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